Php regular expression preg_replace_callback function usage example _ PHP-php Tutorial

This article describes the usage of the php regular expression preg_replace_callback function. The example analyzes the skills related to regular expression replacement by using the preg_replace_callback function. For more information, see the example in this article. Share it with you for your reference. The specific implementation method is as follows:

Php regular expressions are powerful. This example demonstrates the usage of the preg_replace_callback function.

// Define a dummy text, for testing...$Text = "Title: Hello world!\n";$Text .= "Author: Jonas\n";$Text .= "This is a example message!\n\n";$Text .= "Title: Entry 2\n";$Text .= "Author: Sonja\n";$Text .= "Hello world, what's up!\n";// This function will replace specific matches// into a new formfunction RewriteText($Match){  // Entire matched section:   // --> /.../  $EntireSection = $Match[0];  // --> "\nTitle: Hello world!"  // Key   // --> ([a-z0-9]+)  $Key      = $Match[1];  // --> "Title"  // Value   // --> ([^\n\r]+)  $Value    = $Match[2];  // --> "Hello world!"  // Add some bold () tags to around the key to  return '' . $Key . ': ' . $Value;}// The regular expression will extract and pass all "key: value" pairs to// the "RewriteText" function that is definied above$NewText = preg_replace_callback('/[\r\n]([a-z0-9]+): ([^\n\r]+)/i', "RewriteText", $Text);// Print the new modified textprint $NewText;

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